Filter



FIG. 1 is a perspective view of a filter incorporating our new design, viewed from in front of, above, and from the right side thereof;

FIG. 2 is a right side elevation view thereof, the left side elevation view being a mirror image;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof, the bottom plan view being a minor image; and,

FIG. 5 is a front elevation view thereof.

The broken lines in FIGS. 1-5 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a filter, as shown and described. 